| 论新疆北部石炭-二叠纪成煤大地构造 |
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| 引用本文： | 秦苏保.论新疆北部石炭-二叠纪成煤大地构造[J].大地构造与成矿学,1989,13(3):250-257. |
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| 作者姓名： | 秦苏保 |
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| 摘 要： | 研究表明,本区现阶段的构造分区为:天山地洼区,准噶尔地洼区和阿尔泰地洼区,各区演化、发展各具特征,表明地壳演比的不平衡性和差异性,石炭—二叠纪分别处于地槽发展前期和后期,二者无论在沉积环境、古地理条件,还是在构造型式、岩浆活动强度上都存在明显的差异。前期形成的聚煤盆地属海相环境,受近东西、北西西向地槽构造系的控制,火山话动强烈,系典型的优地槽沉积;后期形成的聚煤盆地属海陆交替相、陆相环境,为山间坳陷型盆地,受地槽褶皱山系的控制,以快速升降运动和快速堆积为特色,盆地中沉积了巨厚的磨拉式建造。石炭—二叠纪的沉积环境和构造条件不利于聚煤作用的发生和持续进行,致使海盆边缘和陆盆中未能形成良好的含煤岩系。因此,新疆北部地槽区与华北地合区相反,石炭—二叠纪不是理想的成煤时期,地槽期的海盆和地槽褶皱带期的山间坳陷也不是理想的聚煤盆地,这为该区的大地构造条件所决定。
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| 关 键 词： | 成煤大地构造 石炭—二叠纪 新疆北部 |
oN THE PERMO-CARBONIFEROUS COAL-FORMING GEOTECTONICS IN NORTHERN XINJIANG |
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| Abstract: | In the course of geologic development North Xinjiang underwent geosyncline and platform stages,and is in diwa stage now. According to the characteristics of geotectonic deve_ lopment in different areas of North Xinjiang, three tectonic areas, the Tianshan. Junggar and Altai diwa areas, were recognized. They are different from each other in tectonic development, and show unequilibrium and differentia of crustal evolution. The Carboniferous and Permian represent the early period (geosynclinal period)and late period (geosynclinal fold zone period) of geosynclinal development respectively. They are markedly different from each other in sedimentary environment, palaeogeographic conditions, tectonic pattern and the intensity of magmatic activity. The coal_accumulating basins formed in the early period were marine environments, which were controlled by the east_west and west_northwest gcosynclinal tectonic systems. There were intense volcanism and eugeosynclinal sedimentation in them. The coal -accumulating basins formed in the late period were sea-continent alternate and continental environments, and intermontane troughs, which were Controlled by geosynclinal fold mountain systems. They were characterized by quick upward and downward movements and sediment accumulation, and thick molasse formations were laid down. in them. The Carboniferous and Permian. sedimentary environments and tectonic, conditions were unfavorable for the occurrence and continual getting on of coal_accumulation, so that good coal measures have not formed on the margin of the sea basin and in the continental basins. Therefore, contrary to the North China platform, in the northern Xinjiang geosyncline area, the Permo-Carboni_ferous was not an ideal period of coal formation and the sea basin of the geosynclinal period and the intermontane trough of the geosynclinal fold zone period were also not ideal coal_accumulating sites. This was determined by the geotectonic conditions of North Xinjiang. |
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| Keywords: | coal_forming tectonics Permo_Carboniferous North Xinjiang |
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